Process Capability Index in Petroleum Engineering?

I read an SPE paper No 103319. Very interesting. It is about the application of Process capability index application to evaluate the realibility of well test data. The question to be answered is: to plot % change of oil flow rate that could be detected by well test versus confidence interval. It is a pity that the authors did not explain the process to create the chart in detail. Tried to read all the references of the paper but no luck. anybody please

Answer:
*Process capability compares the output of an in-control process to the specification limits by using capability indices. The comparison is made by forming the ratio of the spread between the process specifications (the specification "width") to the spread of the process values, as measured by 6 process standard deviation units (the process "width").
*We are often required to compare the output of a stable process with the process specifications and make a statement about how well the process meets specification. To do this we compare the natural variability of a stable process with the process specification limits.
A capable process is one where almost all the measurements fall inside the specification limits
*A process capability index uses both the process variability and the process specifications to determine whether the process is "capable" .

For calculation and chart,please visit:
http://www.itl.nist.gov/div898/handbook/...

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Process Capability Index in Petroleum Engineering?

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